condition mean min max ZT0-3 32.09685 25.07385 39.11985 ZT4-7 14.47175 14.47175 14.47175 ZT8-11 10.282805 10.282805 10.282805 ZT12-15 0 0 0 ZT16-19 15.2184 15.2184 15.2184 ZT20-23 20.48905 20.48905 20.48905